Compilare: user.cpp: In function ‘void kruskal()’: user.cpp:37:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=v.size();i++) ^ user.cpp:40:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<q.size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:68:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v.size();i++) ^ user.cpp:71:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v.size();j++) ^